HTTP Error 403.14 - Forbidden

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C#

ASP.NET

C#4.0

Hello friend

I made a admin folder in which i set the login details.when user want to login then user go like that : domainname/admin/login.aspx

but when i type domainname/admin then default go to this link: domainname/admin/login.aspx
and open my lonin panel but I get an error....
can you tell me how to fix this error

HTTP Error 403.14 - Forbidden

The Web server is configured to not list the contents of this directory.

when I go like this then still get an error

<customErrors mode="RemoteOnly" defaultRedirect="error.html">
    <error statusCode="403" redirect="error.html" />
    <error statusCode="505" redirect="error.html" />
    <error statusCode="404" redirect="FileNotFound.html" />
</customErrors>

or when i set default page using web.config file like this

<system.webServer>
  <defaultDocument>
    <files>
      <clear />
      <add value="login.aspx" />
    </files>
  </defaultDocument>
</system.webServer>

then permanently Login.aspx set as a default when i open my main domain

so please tell me how to fixed this

HTTP Error 403.14 - Forbidden
The Web server is configured to not list the contents of this directory.